Answers

2016-04-05T18:46:23+05:30
15 do not end with digit 0 for any natural number n.
It always ends with 5.
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2016-04-05T19:46:06+05:30
15^n = (3 × 5)^n
Since, 3^n or 5^n cannot end with 5, 15^n cannot end with 5.
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